<template>
	<view>
		<my-search @click="gotoSearch"></my-search>
		
		<view class="sroll-view-container">
			<!-- 左侧的滑动区域 -->
			<scroll-view class="left-scroll-view" scroll-y :style="{height: wh + 'px'}">
				<block v-for="(item,index) in cateList" :key="item.cat_id">
					<view :class="['left-scroll-view-item', index === active? 'active' : '']" @click="activeChanged(index)">{{item.cat_name}}</view>
				</block>
			</scroll-view>
			<!-- 右侧的滑动区域 -->
			<scroll-view class="right-scroll-view" scroll-y :style="{height: wh + 'px'}" :scroll-top="scrollTop">
				<view class="cate-lv2" v-for="(item2,index2) in cateLevel2" :key="item2.cat_id">
					<view class="cate-lv2-title">
						/ {{item2.cat_name}} /
					</view>
					<!-- 动态渲染三级分类的列表数据 -->
					<view class="cate-lv3-list">
						<!-- 三级分类 item项 -->
						<view class="cate-lv3-item" v-for="(item3, index3) in item2.children" :key="item3.cat_id" @click="gotoGoodsList(item3)">
							<!-- 图片 -->
							<image :src="item3.cat_icon"></image>
							<!-- 文本 -->
							<text>{{item3.cat_name}}</text>
						</view>
					</view>
				</view>
			</scroll-view>
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				// 当前设备可用的高度
				wh: 0,
				cateList: [],
				active: 0,
				// 二级分类列表
				cateLevel2: [],
				// 滚动条距离顶部的距离
				scrollTop: 0
			};
		},
		onLoad() {
			const sysinfo = uni.getSystemInfoSync()
			this.wh = sysinfo.windowHeight - 50
			
			this.getCateList()
		},
		methods: {
			async getCateList() {
				const { data: res } = await uni.$http.get('/api/public/v1/categories')
				// 判断请求状态
				uni.$checkStatus(res.meta.status)
				this.cateList = res.message
				// 为二级分类赋值
				this.cateLevel2 = res.message[0].children
				// 提示成功
				uni.$showMsg('数据请求成功')
			},
			activeChanged(index) {
				this.active = index
				// 为二级分类列表重新赋值
				this.cateLevel2 = this.cateList[index].children
				this.scrollTop = this.scrollTop === 0 ? 1 : 0
			},
			// 点击三级分类项跳转到商品列表页面
			gotoGoodsList(item3) {
			  console.log(item3);
			  uni.navigateTo({
			    url: '/subpkg/goods_list/goods_list?cid=' + item3.cat_id
			  })
			},
			// 跳转到分包中的搜索页面
			gotoSearch() {
				uni.navigateTo({
					url: '/subpkg/search/search'
				})
			}
		}
	}
</script>

<style lang="scss">
.sroll-view-container {
	display: flex;
	
	.left-scroll-view {
		width: 120px;
	}
	
	.left-scroll-view-item{
		background-color: #f7f7f7;
		line-height: 60px;
		text-align: center;
		font-size: 12px;
		
		&.active {
			background-color: #FFFFFF;
			position: relative;
			
			&::before{
				content: '';
				display: block;
				width: 3px;
				height: 30px;
				background-color: #C00000;
				position: absolute;
				top: 50%;
				left: 0;
				transform: translateY(-50%);
			}
		}
	}
}

.cate-lv2-title {
	font-size: 12px;
	font-weight: bold;
    text-align: center;
	padding: 15px 0;
}

.cate-lv3-list {
	display: flex;
	flex-wrap: wrap;
	
	.cate-lv3-item {
		width: 33.33%;
		margin-bottom: 10px;
		display: flex;
		flex-direction: column;
		align-items: center;
		
		image {
			width: 60px;
			height: 60px;
		}
		
		text {
			font-size: 12px;
		}
	}
}
</style>
